Front Panel Facilities - Pioneer D-23 Operating Instructions Manual

FRONT PANEL FACILITIES

POWER SWITCH (WITH PILOT LAMP)
The push ON power switch incorporates a built-in muting
circuit to suppress the generation of any noise during the
switching action. Consequently, no sound will be heard
during the first few seconds after turning the power ON.
LOW
200
160 250
125
100
80
63 630
Hz
1 6 1 4
18 12
20 10
22 8
24 6
26 4
28 2
F L A T
30
0
dB
6
L
L E V E L
R
18
ON
POWER
OFF
LEVEL CONTROLS
(LOW, MID-LOW, MID-HIGH, HIGH)
These controls are for adjusting output levels of each
frequency range. Left and right channels are adjusted
independently.
FREQUENCY SELECTOR AND SLOPE SELECTOR CONTROLS
Crossover frequencies between each frequency range are
determined by the cut-off frequencies in each range and
the selected slope for each of these frequencies. Cut-off
frequencies are selected by the frequency selector controls
along the top row, while slope characteristics are selected
by the slope selector controls along the bottom row. But
if any slope selector control is set to FLAT, the cut-off
frequency selected by the corresponding frequency selec­
tor control will become irrelevant, resulting in a flat
frequency response across all frequency ranges.
LOW LP*: Control for selection of slope and cut­
off frequency at upper limit of low
range frequency (LOW). (See Fig. A).
MID-LOW HP*: Control for selection of slope and cut­
off frequency at lower limit of low to
mid-range frequency (MID-LOW). (See
Fig. B).
MID-LOW LP: Control for selection of slope and cut­
off frequency at upper limit of low to
mid-range frequency (MID-LOW). (See
Fig. C).
MID-LOW
200 1k
160 250 800
320 125 320 630
400 100 400 500
500 80 500 400
63 630 320
Hz Hz
CROSSOVER
1 6 1 4
18 12
20 10
22 8
24 6
26 4
28 2
F L A T
30
0
dB
6
L
L E V E L
12 12
R
18
dB /oct
SLOPE
FREQUENCY SELECTOR CONTROLS
(S ee below}
MID-HIGH
1k 5k
125k 800 125k 4k
16k 630 16k 3.2k
2k 500 2k 2.5k
2.5k 400 2.5k 2k
3.2k 320 3.2k 1.6k
Hz Hz
CROSSOVER
1 6 1 4
18 12
20 10
22 8
24 6
26 4
28 2
F L A T F L A T
30
0
dB
6 6
L
L E V E L
12 12
R
18 18
dB /oct
SLOPE
MEMORY MARKERS
These markers will prove very useful in marking pre­
selected levels for comparison purposes and other fine
adjustments.
SLOPE SELECTOR CONTROLS
--�----�,-,--- - -- · - ----·
�
MID-HIGH HP:
MID-HIGH LP:
HIGH HP:
*LP: Low-pass filter
HP: High-pass filter
NOTE:
If the tweeter and mid-range speakers receive signals
whose frequencies
limits, rupture of those speakers may result. Therefore,
be especially careful when switching the slope selector
controls, particularly when selecting the FLAT position.
HIGH
5k
6.3k 4k 6.3k
8k 3.2k 8k
10k 2.5k 10k
12.5k 12.5k 2k 12.5k
16k 1.6k 16k
Hz
CROSSOVER
1 6 1 4
18 12
20 10
22 8
24 6
26 4
28 2
F L A T
30
0
dB
6 6
L
L E V E L
12 12
R
18 18
dB /oct
SLOPE
ELECTRONIC CROSSOVER NETWORK D-23
(See below)
Control for selection of slope and cut­
off frequency at lower limit of mid-to
high range frequency (MID-HIGH). (See
Fig. D).
Control for selection of slope and cut­
off frequency at upper limit of mid-to
high range frequency (MID-HIGH). (See
Fig. E).
Control for selection of slope and cut­
off frequency at lower limit of high
range frequency (HIGH). (See Fig. F).
Note that this slope selector control has
no FLAT position.
are below their respective lower